They royally suck. I had one recently that was pitted underneath the gasket that appeared to have extra stuff on it.
when you take them off you will need to clean the head completely and dont use any real harsh abrasive.
clean up the heads to make sure the pitting hasnt gotten by the seals of the cylinder wall.
the wall is about a 1mm thick and inside that area on the head it can start to pitt.
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